Add Zapier interface simulator, tree-node Merkle lookups, and user docs

In-process trace console validates hops, faults, recoveries, and
suggested changes before zapier-platform push. User guide covers
signup through central-chain and bulk-summary tree-node hash lookup.

packages/docs-master/modules/verae-tree-node/NATS.md

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+# NATS — verae-tree-node
+
+| Direction | Address | From / to | Body |
+|-----------|---------|-----------|------|
+| IN | `verae.archive.put` | merkle builder | `{ sha256, kind: "tree", record: { merkleRoot, proof, leafIndex, chainSealJobId } }` |
+| IN | `verae.archive.query` | aggregator (broadcast) | `{ correlationId, sha256, kinds: ["tree", …] }` |
+| OUT | `verae.archive.reply.<correlationId>` | aggregator | only if bloom.mightHave(sha256) |

packages/docs-master/modules/verae-tree-node/SUMMARY.md

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+# verae-tree-node
+
+**Job:** Hold inclusion proofs for SHA-256 leaves that were registered only as part of a bulk Merkle summary. The main Verae chain itemizes the **root**, not each leaf.
+
+**Expects messages from:** middleware batch path (`verae.archive.put` kind `tree`); aggregator (`verae.archive.query`).
+
+**Sends messages to:** `verae.archive.reply.<correlationId>` on bloom hit.
+
+**Does not talk to Zapier.** Same bloom-silence rule as `verae-archive-worm`.

packages/docs-master/modules/verae-zapier-simulator/NATS.md

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+# NATS — verae-zapier-simulator
+
+In-process replay of `jobs.watch`, `jobs.events`, `archive.put`, `archive.query`, `archive.reply.*`. No live subscribe.

packages/docs-master/modules/verae-zapier-simulator/SUMMARY.md

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+# verae-zapier-simulator
+
+**Job:** Zapier-like UI + hop-by-hop trace console to validate messaging, assumptions, delays, failures, recoveries, and suggested modifications before `zapier-platform push`.
+
+**Expects:** HTTP `:3847` or `Simulator.run` in tests.
+
+**Sends:** nothing to live NATS / Zapier / Verae.

packages/docs-master/modules/zapier-user-docs/NATS.md

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+# NATS — zapier-user-docs
+
+Static docs. Users never configure NATS in Zapier.

packages/docs-master/modules/zapier-user-docs/SUMMARY.md

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+# zapier-user-docs
+
+**Job:** Customer guide from signup through register, central-chain lookup, and tree-node lookup of bulk-summary leaves.